负载Pt催化剂在卤代硝基苯氢化反应中的催化性能研究

考察了常压、303K反应条件下，γ—Al2O3、TiO2和ZrO2上负载的铂催化剂在卤代硝基苯的氢化反应中的催化性能，同时考察了过渡金属(Cr，Mn，Fe，Co，Ni和Cu)改性Pt/ZrO2的催化性能．不同负载的铂催化剂加氢活性次序为：Pt／TiO2＞Pt／γ—Al2O3＞Pt/ZrO2，相应的对氯苯胺(p—CAN)选择性次序为：Pt／TiO2＞Pt／ZrO2＞Pt／γ—Al2O3．KBH4处理过的催化剂显示了较高的催化活性．Mn、Fe和Co的引入同时提高了Pt／ZrO2催化剂的催化活性和p—CAN选择性．PtNi／ZrO2催化剂随着Ni含量的增加，催化活性降低，但产物p—CAN的选择性都超过99％．     

现代媒体在体育舞蹈律动教学中的运用

将录音、录像、摄像及网络等现代媒体与传统教学方式结合起来，可使教学过程最优化。该文结合作者的体育舞蹈律动教学实践，论述了现代媒体在体育舞蹈律动教学各环节中的作用，并阐明了其具体的教学过程。     

手性环丁内酯取代的氨基噻二唑的合成研究

探讨了手性源(R)-(-)-5-[(1R)-孟氧基]-2(5H)-呋喃 酮与氨基噻唑类化合物的不对称Michael加成反应,并利用该反应合成了6个新型手性环丁内酯取代的氨基噻二唑类化合物,所有产物均经过1HNMR、 IR、旋光度和元素分析等给予确证. 结果显示氨基噻唑中的氨基主要是从孟氧基所在位置的反面进攻β-碳原子 .     

一类具有光学活性胆甾液晶聚合物的合成与表征

介晶单体十一烯酸胆甾醇酯(M1)和非介晶手性单体十一烯酸薄荷醇酯(M2)通过接枝共聚引入聚甲基含氢硅氧烷(PMHS)中,制得系列侧链液晶聚合物P0～P8·通过傅立叶转换红外光谱(FT-IR)、差示扫描量热仪(DSC)、热失重分析(TGA)、偏光显微镜(POM)、X射线衍射分析(WAXD,SAXS)等手段对聚合物的结构、热致液晶性能及热性能进行了表征·聚合物P0～P8均为胆甾型热致液晶,具有较宽的介晶相范围,呈现出典型的胆甾液晶彩色Grandjean织构及油丝织构,但其液晶性能在非介晶的手性单体M2质量分数大于30%时开始变弱·聚合物都具有较高的热稳定...     

Functionalization of graphene materials by heteroatom-doping for energy conversion and storage

Recent development in nanoscience and nanotechnology has opened up new frontiers in materials science and engineering to create new materials for energy generation and storage. Owing to their earth abundance, low-cost, structural tunability, large-surface area, and unique physicochemical properties, graphitic carbon materials have attracted a great deal of attention for energy-related applications. However, the pristine graphene materials without functionalization is intractable (insoluble and infusible), which has hindered their practical applications. Therefore, considerable research effort has been devoted to the development of functionalized graphene materials with desirable properties for specific applications, including energy conversion and storage. It was demonstrated that functionalized graphene materials with tunable work functions were useful as charge-extraction materials to effectively improve solar cell performance while those with high electrocatalytic activities could be used as metal-free catalysts in fuel cells, metal-air batteries, water splitting and integrated energy systems. This article provides a timely focused review on the development of heteroatom-doped graphene materials for low-cost, but efficient, energy generation and storage.     

丙烯的催化二聚

为筛选丙烯二聚催化剂,探讨丙烯二聚反应的活性中心及反应机理,制备了一系列Ｚｎ或ＺｎＭｇ 、ＺｎＮｉ 双组分改性ＺＳＭ５ 沸石催化剂,采用ＩＲ、ＮＨ３ＴＰＤ 研究了其表面酸性,用脉冲微反技术评价了它们的丙烯转化活性和二聚选择性－ 结果表明：在指定反应条件下,ＺｎＭｇ／ＮＨ４ＺＳＭ５（ＩＭ） 样品的丙烯转化率达９４－２ ％ ,二聚选择性近１００ ％ － 在此样品上丙烯二聚按正碳离子机理进行,其活性中心是Ｂ 酸中心;强Ｂ 酸减少,丙烯二聚选择性增加     

Preparation of ( )-1-Phenylethylamine by Optical Resolution of Racemic 1-Phenylethylamine with a Chiral Biopolymer,Casein

1 Results It has been reported that crystalline form racemates can be resoluted by various methods[1],but for optical resolution of liquid form racemates,the method is limited in chromatograph.So chiral compounds cannot be obtained on large scale by such method.In our previous paper,( )-3-chloro-1,2-propanediol has been obtained by optical resolution of its racemata (liquid) with a chiral biopolymer,casein[2].     

杯芳烃催化剂的研究进展

杯芳烃特殊的结构和易于衍生化的特点使其在用作催化剂方面具有独特的优势.本文综述了国内外近年来杯芳烃在反相转移催化剂、模拟酶及其他催化性能方面的研究进展.     

手性相转移催化剂的研究进展与应用

综述了近几年来手性相转移催化剂的研究进展,主要介绍了由金鸡纳生物碱衍生物和联萘酚衍生物等制备的催化剂,同时还介绍了国内在手性相转移催化剂方面比较成功的例子, 以及一些有代表性的催化剂在 Michael 加成反应、活性亚甲基的烷基化反应和环氧化反应等中的应用.     

去甲万古霉素手性固定相的制备及其对5-甲基-5-苯基乙内酰脲的拆分

将去甲万古霉素作为手性选择剂键合到硅胶载体上,制备成一种新型的手性固定相,用该手性固定相拆分5-甲基-5-苯基乙内酰脲.在反相和极性有机流动相中,5-甲基-5-苯基乙内酰脲能够被对映分离.考察了反相流动相模式下流动相组成、柱温、缓冲液pH值和体积流量对拆分的影响.在反相模式下,流动相为V(甲醇)∶V(质量分数为2%的三乙胺醋酸(pH5.5))=10∶99,体积流量0.6 mL/min,柱温20℃时能获得很好的拆分效果.